fix: Stop games on deletion

[faucomte97]

• Mark games as stopped when deleting them
• There was no need to stop them on worksheet change actually as it does not delete and recreate a game as far as the DB is concerned.
• Added a few fields in the Django admin so we can check game creation time as well as archived state.

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This change is 

[codecov[bot]]

Codecov Report

Merging #1791 (f2f316e) into master (551c009) will increase coverage by 0.00%. The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master    #1791   +/-   ##
=======================================
  Coverage   67.44%   67.45%           
=======================================
  Files         183      183           
  Lines        3772     3773    +1     
  Branches      264      264           
=======================================
+ Hits         2544     2545    +1     
  Misses       1200     1200           
  Partials       28       28           

Impacted Files	Coverage Δ
aimmo/admin.py	64.70% <100.00%> (ø)
aimmo/views.py	93.46% <100.00%> (+0.04%)	:arrow_up: